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Really fix testb optimization on big-endian.

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Fixes ppc32 bootstrap.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58979 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen 2008-11-10 07:16:42 +00:00
parent 11bb6c6d2c
commit baf26b2d3e
1 changed files with 8 additions and 5 deletions
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13
lib/CodeGen/SelectionDAG/TargetLowering.cpp
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@ -1353,7 +1353,6 @@ TargetLowering::SimplifySetCC(MVT VT, SDValue N0, SDValue N1,
}
}
#if 0
// If the LHS is '(and load, const)', the RHS is 0,
// the test is for equality or unsigned, and all 1 bits of the const are
// in the same partial word, see if we can shorten the load.
@ -1364,17 +1363,23 @@ TargetLowering::SimplifySetCC(MVT VT, SDValue N0, SDValue N1,
isa<ConstantSDNode>(N0.getOperand(1))) {
LoadSDNode *Lod = cast<LoadSDNode>(N0.getOperand(0));
uint64_t Mask = cast<ConstantSDNode>(N0.getOperand(1))->getZExtValue();
uint64_t bestMask = 0;
unsigned bestWidth = 0, bestOffset = 0;
if (!Lod->isVolatile()) {
if (!Lod->isVolatile() && Lod->isUnindexed()) {
unsigned origWidth = N0.getValueType().getSizeInBits();
// We can narrow (e.g.) 16-bit extending loads on 32-bit target to
// 8 bits, but have to be careful...
if (Lod->getExtensionType() != ISD::NON_EXTLOAD)
origWidth = Lod->getMemoryVT().getSizeInBits();
for (unsigned width = origWidth / 2; width>=8; width /= 2) {
uint64_t newMask = (1ULL << width) - 1;
for (unsigned offset=0; offset<origWidth/width; offset++) {
if ((newMask & Mask)==Mask) {
if (!TD->isLittleEndian())
bestOffset = (origWidth/width - offset - 1) * (width/8);
else
else
bestOffset = (uint64_t)offset * (width/8);
bestMask = Mask >> (offset * 8);
bestWidth = width;
break;
}
@ -1385,7 +1390,6 @@ TargetLowering::SimplifySetCC(MVT VT, SDValue N0, SDValue N1,
if (bestWidth) {
MVT newVT = MVT::getIntegerVT(bestWidth);
if (newVT.isRound()) {
uint64_t bestMask = Mask >> (bestOffset * 8);
MVT PtrType = Lod->getOperand(1).getValueType();
SDValue Ptr = Lod->getBasePtr();
if (bestOffset != 0)
@ -1402,7 +1406,6 @@ TargetLowering::SimplifySetCC(MVT VT, SDValue N0, SDValue N1,
}
}
}
#endif
// If the LHS is a ZERO_EXTEND, perform the comparison on the input.
if (N0.getOpcode() == ISD::ZERO_EXTEND) {